Would a primarch and a whole legion be able to take out the dark eldars if they found a webway portal into commorragh ?
I mean from reading the raid on Commorragh in lexicanum it was just the Salamenders that did allot of damage.
I honestly think, that an entire legion attacking commorragh directly would have devastating effects on Commoragh and the dark eldar. just imagine Horus and his legion, or for example the Imperial fists or Ultramarines as a legion with primarch and all entering the webway and comming out over commoragh and unleashing all hell. I think it might actualy end up becoming a cull.